Element



G. G. FLOYD.

STROPPING ELEMENT.

APPLICATION FILED IAN! 28. 1918.

Lmr., Patented May 27,1919.

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STBJOPPING ELEMENT.

Specification of Letters Patent.

Patented May 27, 1919.

186,38. Divided and this application led January 28,

1918. Serial No. 214,090.

To all whom z't may concern.'

Be it known that I, Gnonon'G. FLOYD, a citizen of the United States,residing at Riverside, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Stropping Elements, ofwhich the following is a specification.

In stropping or sharpening appliances, such, for example, as thoseemployed for the sharpening of the edges of razor blades, difficulty hasheretofore been experienced in securing the leather or other stroppingfacing to the rotary or oscillatory drum or roller in such manner thatit will be adequately secured thereto, perfectly smooth, free frompossibility of detachment, and in such a way that atmospheric changesshall have no effect on the securing means. It has heretofore beencustomary, for example, to glue or cement leather facings or surfacingson to the curved surfaces of wooden rollers or drums, but it is onlywith difficulty that the facing can be made to adhere perfectly smoothlyand even if the leather is initially free from wrinkles, ridges, and thelike, the moisture of the atmosphere is likely to act detrimentally onthe cement, to say nothing of the possibility of the underlying woodenroller warping, twisting, or cracking. r1`he present invention aims toovercome these various diiiiculties, by providing a stropping orsharpening element composed solely of metal and leather and otherfacing, the main body of the roller being formed of a properly bentmetal shell to which the leather covering is fastened by the metal ofthe shell itself, as, for instance, by means of suitable holding teeth.In order to insure that the lea-ther shall be perfectly smooth, it isapplied or fastened to the metal sheet of which the roller or drum iscomposed before the latter is fully bent to shape, whereby, when theinal bending of the metal occurs, the leather will be automaticallystretched smooth over the drums surface.

In the accompanying drawing forming a part of this specification, and towhich reference should be had, I have illustrated a preferred anddesirable embodiment of the invention and throughout the various viewsof such drawing like reference characters refer to the same parts'.

In this drawing:

Figure 1 is a face view or side of one of the improved stropping orening elements; Y

Fig. 2 is a plan view of the same;

Iiig. 3 is a central longitudinal section on line 3 3 of Fig. 2;

Fig. L isy a cross-section on line 4-4 of Fig. 1.;

Fig. 5 is an end view of the stropping element, and

Fig. 6 is a face view of the inner side of the gear mounted at one endof the drum.

Referring to the drawing, it will be observed that the new structurecomprises a hollow shaft 10 made of sheet-metal bent up to cylindricalform, bringing its two longitudinal edges 11 and 12 into abuttingrelation. One end `of such hollow or tubular shaft is provided with anintegral end flange 13 and at its opposite ends the metal of the shaftis bent outwardly or shaped to form two integral short alined orregistering keys 14C and 15. @ver this shaft and bearing against theinner face of the flange a washer 16 is fitted, and neXt to this on theshaft and held against turning thereon by the key portion 14 is a gear17, both the washer and the gear having central openings to receive theshaft and its projection. As is more clearly shown in Figs.v 3 and 6,the inner face of this gear has a groove 18 partially circular andpartially flattened. Such groove accommodates the end portion of asheet-metal drum or roller 19 ofthe same shape, the opposite end of suchmember 19 being received and held in a similar groove 20 in the innerfaceof a disk 21 of the same general shape as, but of somewhat largersize, than, the drum or roller. This disk is centrally perforated orapertured to fit the shaft and the key 15 which prevents it from turningthereon. At the outer side of such disk the shaft is equipped with aflanged collar or sleeve 22 held thereon by upsetting the end of theshaft at a1 plurality of points 23. Thus, it will be seen that thesheet-metal body of the stropper is firmly held between elevationsharpouter or marginal edges of such sections 25,

25, having inturned sharp teeth 26 embedded yin the leather facing 27covering the metal body. Such parts 25, 25, and their teeth, constitutethe sole securin means for the leather coverin Desirab y, such leatherpiece is thus astened to the sheet-metal drum before the latter is fullybent to shape, whereby, when the completion of the bending is effected,the leather will be neatly and smoothly stretched over the outersurface.

Clearly, it is practically imposible for the leather facing to becomeunfastened or detached in ordinary usage of the appliance, the body ofthe roller will not warp, twist, or crack, and there is no glue orcement likely to more or less lose its adhesive propertics Iby reason ofclimatic conditions. With this improved device, the leather is alwayssmoothly bent over the surface of the drum Without danger of wrinkling,ridging, fluting, or detachment. The metal portion of the drum isprevented from distortion by reason ofthe fact that its ends aresecurely held in the grooves of the end members, which, of course,obviates any diliculty from this score.

To those skilled in this art it will be apparent that many minormechanical changes may be incorporated in the structure illustrated anddescribed without departure from the invention and without sacrificingany of its substantial advantages.

This application is a -division of my former application, Serial No.186,838, razor blade Sharpeners, filed August 18, 1917.

I claim:

l. A stropping element of the character described, comprising incombination a hollow roller formed of sheet-metal bent'u transverselyinto general semi-cylindrlca form, andv a stropping facing transverselyVstretched over the outer surface of said roller, the longitudinal edgeportions of said metal roller at the flattened part thereof being bentoutwardly in opposite directions over substantially the full length ofthe marginal portions of the facing, the outer edges of said rollerportions each havin a series of inwardly-extended teeth embedded in theouter surface of said facing, said portions and teeth constituting thesole means fastening the facing to the roller, substantially asdescribed.

2. A stropping element of the character described, comprising incombination a hollow roller formed of sheet-metal bent up transverselyinto general semicylindrical form, and a stropping facing transverselystretched over the outer surface of said roller, the longitudinal edgeportions of said metal roller at the flattened part thereof-abeing bentoutwardly in opposite directions over substantially the full length, ofthe marginal portions of the facing, the outer edges of said rollerportions having inwardly-extended means embedded in the outer surface ofsaid facing, said portions and inwardly-extended means constituting thesole means fastening the facingto the roller, substantially asdescribed.

GEORGE G. FLOYD.

